LinuxQuestions has published an interview with Jeremy Hogan of Red Hat

LQ) How will Fedora effect older but popular releases, such as RHL7.3 (ie. will they be picked up and supported beyond the RH EOL date)?

JH) End of life is the official end of Red Hat technical and product support for things like 7.*. Fedora is not the migration path for those products if you are interested in support, 5-7 years of errata, ISV/IHV certification, training, and stability of the API/ABI. Fedora is for developers, contributors, beta testers, hobbyists, and enthusiasts.